<template>
    <div>
<!--        顶部滑动条-->
        <div id="slider" class="mui-slider">
            <div id="sliderSegmentedControl" class="mui-scroll-wrapper mui-slider-indicator mui-segmented-control mui-segmented-control-inverted">
                <div class="mui-scroll">
                    <a :class="['mui-control-item',item.id===0? 'mui-active':'']" v-for="item in cates" :key="item.id"  @tap="getPhotoListByCateId(item.id)">
                       {{item.title}}
                    </a>
                </div>
            </div>

        </div>

<!--        图片列表区域-->
        <ul class="photo-list">
            <router-link v-for="item in list" :key="item.id"  :to="'/home/photoInfo/'+item.id" tag="li">
                <img v-lazy="item.img_url">
                <div class="info">
                    <h1 class="info-title">{{item.title}}</h1>
                    <div class="info-body">{{item.zhaiyao}}</div>
                </div>
            </router-link>
        </ul>
    </div>
</template>

<script>
    //1.导入mui的js文件
    import mui from '../../lib/mui/js/mui.min.js'
    export default {
        name: "PhotoList",
        data(){
            return{
                cates:[], //所有分类列表的数组
                list:[],  //所有图片列表的数组
            };
        },
        created() {
            this.getAllCategory();
            this.getPhotoListByCateId(0);  //默认进入页面，就主动请求所有图片列表的数据
        },
        mounted() {  //当组件中的Dom结构渲染好，并放到页面后，会执行这个钩子函数
            //如果要操作元素了，最好在mounted里面，因为这个时候的Dom元素是最新的
            //2.初始化滑块控件
            mui('.mui-scroll-wrapper').scroll({
                deceleration: 0.0005 //flick 减速系数，系数越大，滚动速度越慢，滚动距离越小，默认值0.0006
            });
        },
        methods:{
            getAllCategory(){
                //获取所有的图片分类
                this.$http.get('api/getimgcategory').then(result=>{
                    if(result.body.status === 0){
                        //手动拼接出一个分类2列表
                        result.body.message.unshift({title:"全部",id:0});
                        this.cates=result.body.message;
                    }
                })
            },
            getPhotoListByCateId(cateId){
                //根据分类id获取图片列表
                this.$http.get('api/getimages/'+cateId).then(result=>{
                    if(result.body.status===0){
                        this.list=result.body.message;
                    }
                })
            }
        }
    }
</script>

<style lang="scss" scoped>
    * {
        touch-action: pan-y;
    }
    .photo-list{
        list-style: none;
        margin: 0;
        padding: 10px;
        padding-bottom: 0;
        li{
            text-align: center;
            margin-bottom: 10px;
            position: relative;
            img{
                width: 100%;
                vertical-align: middle;
                box-shadow: 0 0 6px #999;
                border-radius: 10px;
            }
        }
        img[lazy='loading']{
            width: 40px;
            height: 300px;
            margin: auto;
        }
        .info{
            color: #ffffff;
            text-align: left;
            position: absolute;
            bottom:0;
            background-color: rgba(0,0,0,0.4);
            max-height: 85px;
            .info-title{
                font-size: 14px;

            }
            .info-body{
                font-size: 13px;
            }
        }
    }
   
</style>